If you only have one hand tool, make it trowel. It's perfect for planting out and very useful for weeding. This one's made from stainless steel for the best rust resistance and clean movement soil without clogging. The handle is built from sustainably grown hardwood.
It's also a handy measure when you want to leave 30cm / 12in spacings between plants.
Details: Burgon and Ball trowel: Width 7cm, length 30cm